[Sensors] Allow Sensor API only on secure top-level browsing contexts and add frequency checks

device/generic_sensor/public/cpp/platform_sensor_configuration.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/generic_sensor/public/cpp/platform_sensor_configuration.h"
 
+#include "device/generic_sensor/public/interfaces/sensor.mojom.h"
+
 namespace device {
 
 PlatformSensorConfiguration::PlatformSensorConfiguration(double frequency)
     : frequency_(frequency) {
-  DCHECK(frequency_ <= kMaxAllowedFrequency && frequency_ > 0.0);
+  DCHECK(frequency_ <= mojom::SensorConfiguration::kMaxAllowedFrequency &&
+         frequency_ > 0.0);
 }
 
 PlatformSensorConfiguration::PlatformSensorConfiguration() = default;
 PlatformSensorConfiguration::~PlatformSensorConfiguration() = default;
 
+void PlatformSensorConfiguration::set_frequency(double frequency) {
+  DCHECK(frequency_ <= mojom::SensorConfiguration::kMaxAllowedFrequency &&
+         frequency_ > 0.0);
+  frequency_ = frequency;
+}
+
 bool PlatformSensorConfiguration::operator==(
     const PlatformSensorConfiguration& other) const {
   return frequency_ == other.frequency();
 }
 
 bool PlatformSensorConfiguration::operator>(
     const PlatformSensorConfiguration& other) const {
   return frequency() > other.frequency();
 }
 
 }  // namespace device